Numerical simulation on the flow and heat transfer characteristics of rod fuel irradiation device test section
It conducted numerical simulations to examine the uniformity of cooling water temperature in the test section of an irradiation device and to determine if the measured temperature of thermocouple can represent the outlet temperature of the test section.Firstly,the relationship between flow rate and pressure difference in the test section was studied,and the reliability of the selected turbulence model was guaranteed by the hydraulic test data.Then the influence of Reynolds number on the flow and heat transfer characteristics of the test section was analyzed.By selecting the main section of the test section,the temperature non-uniformity coefficient and the maximum temperature difference of the corresponding section were calculated.On this basis,the influence of Reynolds number on the uniformity degree of the temperature field was studied.The results show that the selected turbulence model can well predict the relationship between the flow rate and the pressure difference in the test section.With the increase of the Reynolds number,the heat transfer characteristics of the test section have changed significantly,but the flow characteristics change is not obvious.The design of the test section can significantly improve the degree of unevenness of the cooling water.The difference between the measured average temperature of the thermocouple and the average temperature of the outlet of the test section is on the order of 10-2,demonstrating the appropriateness of the thermocouple arrangement.
numeral calculationflow characteristicsheat transfer characteristicstemperature uniformity
万方数据
维普
